612 results about "Alloy composite" patented technology

The invention discloses a high-entropy alloy bonding phase SiC hard composite material and a preparation method thereof, the SiC hard alloy composite material is a double-phase composite material and comprises SiC and high-entropy alloy, and the high-entropy alloy is AlMnCuiFeTi and AlZnCuFeTi. The proportion of the raw materials is 5 wt.%-20 wt.%. And the size of the SiC particles is 200 [mu] m. During preparation, firstly, the high-entropy alloy is prepared through mechanical alloying; after uniform mixing, a graphite mold is filled with the mixture for prepressing, the prepressing pressure is 10-50 MPa, and prepressing is conducted for 10-30 s; and then hot pressed sintering is carried out, the sintering pressure is 20-50 MPa, the sintering temperature is 1400-2000 DEG C, heat preservation is carried out for 10-90 min, and the high-entropy alloy bonding phase SiC hard alloy composite material is prepared. The liquid phase generated in the high-entropy alloy sintering process is used for reducing the sintering temperature, the organization structure is improved, and the hardness and toughness of the tungsten carbide hard alloy are improved.

The invention discloses a formula, a coating and a method of a dual in-situ precipitation reinforced FeCoNiCr-based high-entropy alloy composite material with a low corrosion-wear synergistic effect. The Al-Co-Cr alloy material comprises the following components in atomic percent: 15 to 30 at% of Al, 10 to 25 at% of Co, 10 to 25 at% of Cr, 10 to 25 at% of Fe, 10 to 25 at% of Ni, 20 to 35 at% of Ti and 5 to 15 at% of C, the preparation method comprises the following steps: filling all metal powder and graphene powder into a ball-milling tank, adding grinding balls, filling argon, sealing, and ball-milling, so as to obtain mixed powder in which the surfaces of metal powder particles are uniformly coated with graphene. The high-entropy alloy composite material with high hardness, high wear resistance and high corrosion resistance is obtained by utilizing the solid solution strengthening effect and the multiple in-situ precipitation strengthening effect of micron-scale TiC and nano-scale precipitation B2. The prepared coating is uniform and compact in structure, is metallurgically bonded with a base material, and has excellent corrosion and friction resistance and low corrosion-wear synergistic effect.

The invention discloses a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of nickel-based alloys, the nickel-based alloy composite plate comprises a stainless steel bottom plate and a nickel-based alloy plate, and the nickel-based alloy plate comprises, by weight, 52-58 parts of nickel powder, 17-21 parts of molybdenum powder, 8-12 parts of copper powder, 7-9 parts of boron powder, 2-3 parts of modified hafnium carbide powder, 4-7 parts of an alloy reinforcing agent and 2-3 parts of a fluxing agent. The modified hafnium carbide prepared from hafnium oxide and nano carbon powder successfully replaces metal hafnium with high cost in the traditional process; and meanwhile, the actual adding proportion of the modified hafnium carbide in the nickel-based alloy plate is greatly reduced, the cost of industrial mass production is doubly reduced from the two aspects of raw material selection and dosage control, and the economic requirement of large-scale production is better met.

The invention discloses a ceramic bonded WC hard alloy and a preparation method thereof, WC hard alloy powder is prepared from W powder, Ti powder, Zr powder and C powder, the mass fraction of the W powder is 85-90 wt.%, the mass fraction of the Ti powder is 2-2.5 wt.%, the mass fraction of the Zr powder is 4-4.5 wt.%, and the mass fraction of the C powder is 6-6.5 wt.%. The W powder, the Ti powder, the Zr powder and the C powder are mixed in a mechanical alloying (MA) mode through a one-step method, the novel high-entropy ceramic combined WC hard alloy composite material is prepared through the SPS sintering technology, the sintering temperature is reduced through vacancy energy in a system, sintering is promoted, introduction of oxygen is reduced, the hardness, fracture toughness, corrosion resistance and other performance of a sintered body are improved, and the service life of the high-entropy ceramic combined WC hard alloy composite material is prolonged. Meanwhile, the technological process is simplified, and the production cost of the hard alloy material is reduced.

The invention provides a method for additive manufacturing of a large-size crack-free titanium-aluminum alloy, and relates to the technical field of additive manufacturing of titanium-aluminum alloy composite materials. The method comprises the steps of setting of a medium-frequency induction heating device, deposition, rapid remelting, in-situ remelting and in-situ heat treatment. According to the method disclosed by the invention, the density of a deposited layer and the integrity of a workpiece are creatively and synergistically improved through an induction heating technology, high-speed remelting scanning of each layer of double laser beams, in-situ remelting and in-situ heat treatment, and the fatigue property, the mechanical property and other properties of the prepared large-size titanium-aluminum alloy are improved; the occurrence probability of thermal stress cracks is greatly reduced; the method is high in resource utilization rate, low in production cost, short in process, easy to operate, high in efficiency, uniform in component distribution of each deposition layer and beneficial to industrial large-scale production and popularization.

A hardened alloy composite material comprising an alloy matrix and reinforcing particles dispersed in the alloy matrix, the reinforcing particles having a shell and core structure, wherein the shell and the core have different chemical compositions, and wherein the reinforcing particles are formed by a MAX phase compound and / or a MAB phase compound.

The invention relates to the field of coatings, and discloses a wear-resistant and corrosion-resistant high-entropy alloy composite coating and a preparation method thereof.The wear-resistant and corrosion-resistant high-entropy alloy composite coating is prepared by depositing functional high-entropy alloy composite powder on the surface of a base body in a laser cladding mode, the functional high-entropy alloy composite powder comprises high-entropy alloy powder, a modified additive and composite ceramic powder, the modified additive is prepared by using urea and titanium tetrachloride as raw materials, growing nano titanium nitride particles on the surface of a silicon carbide nanowire in situ to prepare a nano titanium nitride / silicon carbide nanowire composite material, and then coating a layer of nano titanium dioxide particles on the surface of the nano titanium nitride / silicon carbide nanowire composite material by using tetrabutyl titanate; and the composite ceramic powder is prepared by compounding zirconium carbide, niobium carbide, hafnium carbide and tantalum disilicide. The hardness, wear resistance and corrosion resistance of the high-entropy alloy coating are enhanced by adding the modified additive and the composite ceramic powder.

The invention discloses a preparation method of ODS alloy composite powder for laser additive manufacturing. The invention belongs to the technical field of metal additive manufacturing materials, and particularly relates to a preparation method of oxide dispersion strengthening (ODS) alloy composite powder for laser additive manufacturing. The metal matrix powder is divided into two particle size intervals by taking 30 [mu] m as a particle size critical point, the metal matrix powder in the two particle size intervals is mixed with the nano oxide powder through differential acoustic resonance to form two kinds of composite powder, and the ODS alloy composite powder is obtained by mixing the two kinds of composite powder. According to the method, different high-energy acoustic resonance mixing time is adopted for coating characteristic differences caused by different masses of metal powder (smaller than or equal to 30 microns and gt; 30 microns) in different particle size intervals. And finally, the thicknesses of nano oxide coating layers of all the powder are accurately controlled to be 500 nm or below, and the risks of nano oxide agglomeration and large-size slag formation in the SLM process are remarkably reduced.

The invention provides a friction-resistant high-entropy alloy composite coating and a preparation method thereof, and belongs to the technical field of metal surface modification. A FeCoCrNiMox (x is greater than or equal to 0.18 and less than or equal to 0.25) high-entropy alloy is taken as a main component of composite powder, graphene is taken as an additive phase, and the FeCoCrNiMox high-entropy alloy composite coating is prepared on the surface of a matrix by adopting a laser cladding method. The graphene added in the composite powder can generate carbides in situ under the action of laser cladding, and second phase strengthening, solid solution strengthening and fine grain strengthening are generated, so that the friction resistance of the surface of the matrix is remarkably improved. The preparation method is easy to operate and low in cost, the prepared composite coating is high in bonding strength, good in toughness and plasticity and excellent in friction resistance, the surface performance of equipment can be effectively improved, safe and stable operation of the equipment is guaranteed, the service life of the equipment is prolonged, and maintenance expenditure is reduced.

The invention belongs to the field of photoelectrocatalysis ammonia production, and particularly discloses a Ti (at) TiO2 array (at) CuxPt alloy composite electrode, preparation of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode and application of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode to photoelectrocatalysis NO3 <-> reduction ammonia production, and the Ti (at) TiO2 array (at) CuxPt alloy composite electrode comprises a Ti substrate, a TiO2 nanosheet array growing on the surface of the Ti substrate in an in-situ mode and nano CuxPt alloy particles distributed on the TiO2 nanosheet array in a dispersed mode; tiO2 nanosheets in the TiO2 nanosheet array grow in the Z-axis direction of the Ti substrate; and a heterogeneous interface exists between the nano CuxPt alloy particles and the TiO2 nanosheet array. The self-supporting material provided by the invention has excellent NH3 production activity, Faraday efficiency and stability.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The invention discloses a tungsten mesh reinforced high-temperature titanium alloy composite board with a silicon carbide coating and a preparation method of the tungsten mesh reinforced high-temperature titanium alloy composite board, and belongs to the technical field of composite materials. The problems that the combination effect of the tungsten mesh and the high-temperature titanium alloy is poor, and the mechanical property of the tungsten mesh reinforced high-temperature titanium alloy composite material is poor are solved. A silicon carbide coating is sprayed on the surface of a tungsten mesh, the tungsten mesh with the coating is introduced into a high-temperature titanium alloy plate, and the method specifically comprises the following steps that firstly, the tungsten mesh and the high-temperature titanium alloy plate are pretreated, the tungsten mesh is sprayed, the plate and the tungsten mesh are combined and then subjected to vacuum hot pressing sintering, and high-temperature titanium alloy is subjected to diffusion bonding through meshes of the tungsten mesh; the composite board is obtained. The silicon carbide coating is sprayed on the surface of the tungsten mesh, formation of an interface brittle phase can be inhibited, stress concentration is reduced, a matrix is protected against oxidation and hot corrosion, and the bonding capacity of a reinforcement and the matrix is improved; and meanwhile, the tungsten net can further inhibit creep deformation of the base body at high temperature.

The invention relates to the field of composite coatings, and discloses a wave-absorbing high-entropy alloy composite coating and a preparation method thereof.According to the wave-absorbing high-entropy alloy composite coating, mixed powder is deposited on the surface of a base body in a laser cladding mode to form a pre-coating, then ion nitriding treatment is conducted on the pre-coating, and the wave-absorbing high-entropy alloy composite coating is obtained. The mixed powder comprises high-entropy alloy powder, a functional additive, core-shell antifriction powder and a binder; the functional additive is prepared by taking halloysite, biomass chitosan and ferric chloride hexahydrate as raw materials, adopting a hydrothermal method to obtain an iron modified halloysite / carbon material, and then performing carbon thermal reduction reaction; the core-shell antifriction powder is prepared by uniformly stacking outer-layer aluminum oxide on the surface of nano hexagonal boron nitride by using a non-uniform nucleation method; the ion nitriding treatment process parameters are as follows: nitriding is performed for 58-62 h at the temperature of 540-560 DEG C, flow velocity thermal decomposition ammonia is adopted as a nitrogen source, and the prepared composite coating is high in hardness and good in wear resistance, corrosion resistance and wave absorbing performance.

The invention relates to a device and method for preparing a CoCrFeNi-series high-entropy alloy composite coating through composite plating, and relates to the technical field of metallurgical technology and material scientificity, the device comprises an electroplating liquid tank, an electroplating bath and a magnetic field generator, a dispersion assembly and a heating piece are arranged in the electroplating liquid tank, an electrode assembly is arranged in the electroplating bath, and the magnetic field generator is arranged in the electroplating bath. A circulating assembly used for circulating electroplating liquid is arranged between the electroplating liquid tank and the electroplating bath, and the magnetic field generator is arranged outside the electroplating bath. Composite electroplating is carried out on a to-be-plated metal part under the magnetic field condition, attraction of the content of components of a high-entropy alloy plating layer to ceramic particles is regulated and controlled through the interaction of the magnetic field and an electric field, so that the flatness, particle distribution and content of the plating layer are improved, meanwhile, the appearance, texture and component content of the high-entropy alloy plating layer can be regulated and controlled through application of the external magnetic field, and therefore the high-entropy alloy plating layer is obtained. Therefore, the influence on the overall performance of the coating is avoided, and the preparation efficiency of the CoCrFeNi-series high-entropy alloy composite coating is improved.

The present invention relates to a rare earth oxide dispersion-strengthened FeCoNiCrMn high-entropy alloy coating and a preparation method thereof. The FeCoNiCrMn high-entropy alloy powder comprises: a molar fraction of Fe of 18-22%, a molar fraction of Co of 18-22%, a molar fraction of Ni of 18-22%, a molar fraction of Cr of 18-22%, and a molar fraction of Mn of 18-22%. The FeCoNiCrMn high-entropy alloy powder and rare earth oxide particles are mixed in any reasonable mass ratio. The present invention primarily increases component supercooling by adding rare earth elements, thereby increasing the internal nucleation rate of the coating and achieving grain refinement under laser cladding technology, ultimately enhancing the mechanical properties of the high-entropy alloy composite coating, including hardness, wear resistance, and corrosion resistance. When the Sm2O3 mass content is 2%, the hardness of the composite coating is the highest, which is 15.85% higher than that of the high-entropy alloy coating; with the increase of Sm2O3 mass content, the wear resistance and corrosion resistance of the composite coating tend to first increase and then decrease. When the Sm2O3 mass content is 2%, its wear resistance and corrosion resistance reach the maximum.

The invention relates to the technical field of metal materials, in particular to a ceramic reinforced aluminum alloy composite material and a preparation method thereof. The aluminum alloy composite material comprises the following raw materials in parts by weight: 75-85 parts of an aluminum alloy matrix and 10-20 parts of a ceramic reinforced phase, a preparation method of the ceramic reinforced phase comprises the following steps: step 1, adding silicon carbide and a silane coupling agent into absolute ethyl alcohol, and drying after ultrasonic dispersion; 2, dissolving tetraethoxysilane in an ethanol-water mixed solvent, adjusting the pH value to 3-4, adding the silicon carbide treated in the step 1, stirring to form sol, drying, converting into gel, and calcining to form a coating layer; step 3, dispersing the silicon carbide treated in the step 2 into water, adding nickel nitrate, uniformly stirring, adding a reducing agent, stirring for reaction, and collecting precipitate particles; and 4, adding an interface modifier, and uniformly mixing. The ceramic reinforced aluminum alloy composite material has high strength, high wear resistance and good mechanical property and thermal stability.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

The invention discloses a large-pipe-diameter nickel base alloy composite pipe welding method and an auxiliary device.Each composite pipe comprises a composite layer and a base layer covering the composite layer in a sleeving manner, the welding method comprises the following steps that firstly, the to-be-welded ends of two sets of composite pipes are machined, X-shaped grooves are formed in the positions of the to-be-welded ends of the two sets of composite pipes, and the to-be-welded ends of the two sets of composite pipes are welded; then the X-shaped groove is polished through an auxiliary device; secondly, the two sets of composite pipes are assembled in a butt joint mode, and a base layer is welded according to the sequence of bottoming, filling and capping; and thirdly, the transition layer and the composite layer are sequentially welded according to the bottoming, filling and covering sequence. According to the method, the X-shaped groove is adopted, the double-face welding mode is adopted, argon gas back face protection is not used in the whole welding process, compared with a traditional welding method, the welding material cost is saved, the welding work efficiency is improved, a large amount of argon gas is saved, the welding steps are simplified, the welding material cost is low, the number of welding layers is small, the construction period is shortened, and energy conservation and emission reduction are achieved.

The invention discloses a design and forming method for preparing a titanium-aluminum alloy laminated structure with a strengthened and toughened structure through SLM. According to the design and forming method, an SLM method is adopted, a ductile layer is firstly formed on a substrate, a protruding structure is formed on the ductile layer, then a brittle layer is formed on the ductile layer, the laminating step is repeated, and a laminated structure part is obtained; and in the laminating process, the laminated structure alloy is subjected to in-situ gradient heat treatment, and the titanium-aluminum alloy composite structure workpiece with the strengthened and toughened structure is obtained. According to the method, different titanium-aluminum alloy micro-laminated structures with interconnecting structures such as interlayer ductile protrusions are formed through SLM, and the fracture toughness between the treated ductile layers and the treated brittle layers is obviously improved and can reach 62 Mpa. M < 1 / 2 > or above. According to the method, additional chemical elements and additional mechanical fields do not need to be added, operation is easy, the process is easy to control, and huge potential is provided for application of the TiAl alloy difficult to machine in the aerospace field.

A deformation-driven additive manufacturing method for a low-interfacial-stress aluminum-steel composite structure comprises the steps that an aluminum alloy thin tube is filled with an adding phase with a low thermal expansion coefficient or a negative thermal expansion coefficient and aluminum-silicon powder used for enhancing the thermal plasticizing fluidity of a raw material wire according to the proportion, and after drying treatment, the raw material wire for adjusting the thermal expansion coefficient is manufactured; a continuous wire feeding friction stir additive manufacturing method is adopted, aluminum alloy raw material wires and adjusting raw material wires are synchronously fed according to the rate proportion changing layer by layer, deposition is driven through deformation, and an aluminum alloy composite transition layer with additive phase components changing in a gradient mode is formed; after the aluminum alloy composite material transition layer is completely prepared, the continuous wire feeding friction stir additive manufacturing method is continuously adopted, and continuous deposition is conducted on the aluminum alloy composite material transition layer to form an aluminum alloy deposition layer; and after deposition manufacturing of the component is completed, subtractive machining treatment is carried out, and a final product is obtained. The invention relates to the technical field of dissimilar material additive manufacturing.

The invention discloses a nano hard alloy composite solid electrolyte membrane as well as a preparation method and application thereof, and belongs to the technical field of solid lithium batteries. The nano hard alloy composite solid electrolyte membrane comprises the following raw materials: nano hard alloy modified inorganic solid electrolyte, a spinning polymer, an organic dispersing agent and lithium salt, the nano hard alloy modified inorganic solid electrolyte comprises the following raw materials: nano hard alloy, a fluxing agent, a metal binder and an inorganic solid electrolyte. The invention also discloses a preparation method and application of the nano hard alloy composite solid electrolyte membrane. The problems of poor mechanical property, poor thermal stability, low ionic conductivity and poor electrochemical stability of the polymer solid electrolyte can be solved, and the application prospect is wide.

The invention discloses a preparation method of a copper-zirconium alloy wear-resistant coating based on laser cladding, relates to the technical field of wear-resistant coatings, and is used for solving the technical problem that a high-performance wear-resistant coating cannot be prepared due to poor bonding quality and low cladding efficiency of a cladding layer and a copper-zirconium alloy matrix in the existing laser cladding process. The preparation method of the copper-zirconium alloy wear-resistant coating based on laser cladding comprises the following steps: obtaining a copper-zirconium alloy matrix; preparing a CuSn film layer on the surface of the copper-zirconium alloy matrix, wherein the thickness of the CuSn film layer is 0.5-2 microns; preparing an iron-based coating on the surface of the CuSn film layer, wherein the thickness of the iron-based coating is 0.8-1.0 mm; preparing a wear-resistant layer on the surface of the iron-based coating, wherein the thickness of the wear-resistant layer is 1-1.2 mm; the material for preparing the wear-resistant layer is nickel-based alloy composite ceramic powder, and the nickel-based alloy composite ceramic powder comprises nickel-based alloy and ceramic powder.

The invention discloses a high-entropy metal organic framework compound, a high-entropy alloy composite material and a preparation method and application of the high-entropy metal organic framework compound and the high-entropy alloy composite material. The high-entropy metal organic framework compound comprises a reaction product of an organic ligand, a monometal complex and a cerium source, the organic ligand comprises 2, 2 '-bipyridine-5, 5'-dicarboxylic acid, and the monometal complex comprises at least five of a Pt complex, a Pd complex, a Ni complex, a Cu complex, an Ag complex, an Rh complex and an Ir complex. The high-entropy alloy composite material prepared from the high-entropy metal organic framework compound as a precursor through carbonization and reduction has adjustable metal content and excellent catalytic activity.

The invention discloses an in-situ carbide reinforced refractory high-entropy alloy, a preparation method and application, and belongs to the technical field of powder preparation. According to the preparation method, ingot melting, hydrogenation crushing, plasma spheroidizing and dehydrogenation processes are combined, and a carbon source added in the process is regulated and controlled, so that a carbide reinforced phase is generated in situ in the preparation process of the in-situ carbide reinforced refractory high-entropy alloy; and the preparation of the high-entropy alloy composite powder material with high-uniformity dispersion of the reinforced phase, controllable content and morphology and low impurity content can be realized.

The invention discloses oxide nanoparticle / nickel-based superalloy composite spherical powder and a preparation method thereof. The composite spherical powder comprises nickel-based superalloy spherical powder, phytic acid and oxide nanoparticles. The nickel-based superalloy spherical powder serves as an inner core, phytic acid is chelated on the surface of the nickel-based superalloy spherical powder to serve as a middle layer, and the phytic acid molecular layer is coated with a shell formed by nano-particles. The oxide nanoparticle / nickel-based superalloy composite spherical powder is prepared through a method combining ultrasonic dispersion and high-speed stirring, the original form of the nickel-based superalloy spherical powder cannot be damaged, the prepared composite powder is good in sphericity degree and fluidity, and meanwhile a large number of carbon elements and other impurities cannot be introduced.

The invention relates to the technical field of heat exchange, and particularly discloses a gallium-based alloy composite working medium and a preparation method thereof.The gallium-based alloy composite working medium comprises a main heat transfer fluid and nano particles dispersed in the main heat transfer fluid, and the main heat transfer fluid is liquid gallium-based alloy; the nano particle comprises a metal core, a non-metal shell layer coated outside the metal core and a carbon nano material layer coated outside the non-metal shell layer. The carbon nanomaterial is modified on the surface of the non-metal shell layer, the dispersion condition of nanoparticles in liquid metal is effectively improved, and meanwhile, the carbon nanomaterial can effectively mask silicon hydroxyl on the surface of the non-metal shell layer and prevent self-polymerization tendency between the non-metal shell layers by modifying the surface of the non-metal shell layer.

The invention discloses a welding method for optimizing a welding seam structure of a nickel-based alloy composite board. The nickel-based alloy composite board comprises a base material layer and a nickel-based alloy composite material layer, and a transition layer is arranged at the bonding interface of the base material layer and the nickel-based alloy composite material layer; the welding method comprises the steps that a trapezoidal groove is machined in the position, corresponding to the base material layer, of the welding section of the nickel-based alloy composite board; a U-shaped groove is machined in the position, corresponding to the transition layer, of the welding section of the nickel base alloy; a groove is not machined in the position, corresponding to the nickel-based alloy composite material layer, of the welding section of the nickel-based alloy composite plate, and a truncated edge is reserved; welding the nickel-based alloy composite material layer by adopting single tungsten electrode argon arc welding; welding the transition layer by adopting single tungsten electrode argon arc welding; and welding the base material layer by adopting single tungsten electrode argon arc welding.

The invention provides a carbide reinforced 3D printing titanium-aluminum alloy composite material and a preparation method, and relates to the technical field of 3D printing composite materials. The alloy comprises the following chemical components in atomic percent: 40-50 at% of Al, 2-10 at% of Nb, 0.2-1 at% of Mo, 0.05-2 at% of Si, 0.2-5 at% of C and the balance of Ti and inevitable impurity elements. The preparation method comprises the steps of carbon nanotube coating, TiC powder coating, laser directional energy deposition, thermal deformation and thermal treatment. According to the method, two kinds of titanium-aluminum alloy powder with different particle sizes are creatively subjected to surface coating modification, and the titanium-aluminum alloy powder with different particle sizes and subjected to surface coating modification is conveyed at the same time through double powder bins for laser directional energy deposition, so that the composite material with all parts uniformly enhanced in mechanical property is obtained; the method is high in resource utilization rate, low in production cost, short in process, easy to operate, high in efficiency, uniform in carbide reinforced particle distribution and beneficial to industrial large-scale production and popularization.

The embodiment of the invention discloses an injection-molded long carbon fiber reinforced polyether-ether-ketone alloy composite material and a preparation method thereof. Nano filler modified polyether-ether-ketone alloy powder is prepared from polyether-ether-ketone, modified resin and a nano modifier; preparing soft and hard sizing agent hybrid modified long carbon fibers from continuous carbon fibers and the prepared sizing solution; nano-filler modified polyether-ether-ketone alloy powder, a deionized water solution containing a surfactant and a thickening agent and soft and hard sizing agent mixed modified long carbon fibers are adopted to prepare long carbon fiber master batches; and carrying out injection molding on the long carbon fiber master batch by adopting an optimized injection molding process to prepare the long carbon fiber reinforced polyether-ether-ketone alloy composite material. The mechanical properties, electric conduction, heat conduction and friction properties of the composite material are greatly improved, and the defects of a polymer material in the aspect of functionality are further made up; moreover, the effective retention length of fibers in the injection molding master batch is greatly increased, the organic solvent is prevented from damaging molecular chain segments of a resin matrix, and the injection molding master batch is more environment-friendly.

The invention discloses a manganese-copper alloy composite material and a preparation method thereof. The preparation process comprises the following steps: step 1, adopting copper powder, manganese powder and silicon powder with the purity of 99.9% or above as main elements of a matrix alloy; 2, copper powder, manganese powder, silicon powder and the composite particles are evenly mixed according to the mass percent; step 3, loading the uniformly mixed powder into a mold; 4, sintering the material after hot press molding; 5, the sintered alloy material is subjected to aging treatment; sixthly, hot rolling or hot extrusion treatment is conducted; and 7, the prepared alloy composite material is subjected to polishing or coating surface treatment, and preparation is completed. The manganese-copper alloy composite material is prepared by adopting the steps. The composite particles are added into the manganese-copper alloy to serve as a reinforcing phase, the strengthening phase is formed, the abrasion resistance of the material is greatly improved, the internal component and structure gradient of the material is effectively achieved, and comprehensive improvement of the performance of the manganese-copper alloy is successfully achieved.